分類：謝堅老師來解惑

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“txt”: “【3年級】估算和概算有什麼不同？”
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“txt”: “【3年級】周長和面積怎麼教，學生才不會混淆？”
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“txt”: “【3年級】如何引入乘法直式記錄？包含上乘下、下乘上？”
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“txt”: “【3年級】1盒蘋果有3個，5盒蘋果有多少個？要記成3×5還是5×3？”
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